/*
 * Copyright 2016 Azavea
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package geotrellis.layer

import java.time.{ZoneOffset, ZonedDateTime}

import _root_.io.circe.generic.JsonCodec

object TemporalKey {
  def apply(dateTime: ZonedDateTime): TemporalKey =
    TemporalKey(dateTime.toInstant.toEpochMilli)

  implicit def dateTimeToKey(time: ZonedDateTime): TemporalKey =
    TemporalKey(time)

  implicit def keyToDateTime(key: TemporalKey): ZonedDateTime =
    key.time

  implicit def ordering[A <: TemporalKey]: Ordering[A] =
    Ordering.by(tk => tk.instant)

}

/** A TemporalKey designates the temporal positioning of a layer's tile. */
@JsonCodec
case class TemporalKey(instant: Long) {
  def time: ZonedDateTime = ZonedDateTime.ofInstant(instant, ZoneOffset.UTC)
}
